Anhui Medical University Myofibril LM: Cross striation:I band:Z line A band:H band;M line Sarcomere:-extends from Z line to Z line. =2+A+2I constitutes the functional unit of contraction in skeletal muscle. 置. 州：藏圭 :空。馨日
Anhui Medical University Anhui Medical University Myofibril LM： Cross striation： I band：Z line A band：H band；M line Sarcomere: - extends from Z line to Z line. = ½ I+ A + ½ I - constitutes the functional unit of contraction in skeletal muscle
Anhui Medical University Cross section of skeletal muscle (EM) Myofibrils
Anhui Medical University Anhui Medical University Cross section of skeletal muscle （EM） Myofibrils
Anhui Medical University B.Ultrastructure Myofibril Sarcoplasmic reticulum Mitochondrium Transverse tubule
Anhui Medical University Anhui Medical University B. Ultrastructure Myofibril Sarcoplasmic reticulum Mitochondrium Transverse tubule
Anhui Medical University Skeletal muscle-myofilaments Two types of myofilaments Muscle are associated with cell contraction. Muscle fasciculus They are thin filaments and thick filaments. Muscle fiber H Z A band band band band H带 Mline Z-Sarcomere-Z Myofibril 转利 G-actin molecules ★ Myofilaments F-actin filament Myosin filament
Anhui Medical University Anhui Medical University Skeletal muscle-myofilaments • Two types of myofilaments are associated with cell contraction. • They are thin filaments and thick filaments. H 带